Inside the Drives & Spare Area

The EVO is offered in a single form factor - 2.5" at a 7mm thickness. There are three torx (T5) screws that hold the chassis together, removing them gets you a look at the EVO's very simple internals. Surprisingly enough there's no thermal pad between Samsung's MEX controller and the chassis.

Samsung, like Intel, does a great job of reducing the number of screws and simplifying the assembly of its drives. I would prefer if Samsung didn't insist on using torx screws to hold the chassis together but I'm sure it does have some impact on reducing returns. There's also growing concern of counterfit SSDs which I guess screw choice could somewhat address.

There are two PCB sizes used in the EVO lineup, neither of which occupies the full volume of the 2.5"/7mm chassis. The 120 and 250GB drives use the smallest PCB, while the other drives use the larger layout. The larger PCB has room for 8 NAND packages, while the half length PCB can accommodate two. Each of the NAND packages can hold up to 8 x 128Gbit 19nm TLC die.

To deal with the realities of TLC, Samsung sets aside more of the drive for use as spare area on the EVO than it does on its MLC Pro line. Due to TurboWrite however, the percentage is actually a bit less than it was on last year's 840.

Samsung SSD 840 EVO Memory
Advertised Capacity 120GB 250GB 500GB 750GB 1TB
DRAM Size 256MB LPDDR2-1066 512MB LPDDR2-1066 512MB LPDDR2-1066 1GB LPDDR2-1066 1GB LPDDR2-1066
# of NAND Packages 2 2 4 8 8
# of NAND die per Package 4 8 8 4 8
NAND Capacity per Package 64 GiB 128 GiB 128 GiB 96 GiB 128 GiB
Total NAND 128 GiB 256 GiB 512 GiB 768 GiB 1024 GiB
Spare Area 12.7% 9.05% 9.05% 9.05% 9.05%

I've tossed internal shots of all of the EVO lineup into the gallery below:

Introduction & Pricing Endurance: Not a Problem Even at 19nm
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  • verjic - Thursday, February 13, 2014 - link

    I'm talking about 120 Gb version Reply
  • verjic - Thursday, February 13, 2014 - link

    Also what is Write/Read IOMeter Bootup and Write/Read IOMeter IOMix - what means their speed? Thank You Reply
  • AhDah - Thursday, May 15, 2014 - link

    The TRIM validation graph shows a tremendous performance drop after a few gigs of writes, even after TRIM pass, the write speed is only 150MBps.
    Does this mean once the drive is 75%-85% filled up, the write speed will always be slow?

    I'm tempted to get Crucial M550 because of this down fall.
    Reply

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